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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d38947b202d4514875e409fb9bc5e72789f239925848b58964be33a733ded4' 
  AND token = 'tvRfnFMhR2cjLeKSDZ8IrM7v5zsmXGw1OMfsNCo3HXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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