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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528e5ed815a462138811a297ac9ae70e0c78a4d89ee06f87e5a5a3cb8c1f2464' 
  AND token = 'uAHqWFhwtolZjp6ltffT6sl3yDI+TX94MQnJM/uZhZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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