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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1794f127206d43b2dfcc366dc6e2c957f4202ffa9f7e63b86b3b7e87470e795' 
  AND token = '25uu36BUQCx7XQm4ZnZCuerxB/+N2cdjUqZTiPq37jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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