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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ed91c12030e502626effc3467fe6240c8640edb784094d88781b63be8426b2' 
  AND token = 'ygHZ03tX0al3mquMbj3VSO3+f9jX+edpUYyKX1upDHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}