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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f912c043ccfe5bad9d0a8db9b1a2df9e6ec2ac3ca3b8999fe1cb68faf68f588' 
  AND token = 'KcvuP9iPlmFXXvGNegiPcOROyeBq64sqF63+xvKRcKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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