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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2b97e93d6497a48d35e438b7a8096f3ca6f6d305ff3331f9f1bea43511c86b' 
  AND token = 'pvsKJEcRq23V96N+lulE9nfiCvt/k3zAM/WYHckWdlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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