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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd415a1f0c6479a82a8797670d9e75a7965fda249a499a8e9950722ea703c221' 
  AND token = 'Y0hI3x1yZExpWA6FqDFIvIoPtYwTi8MqiEgW+Dg6vis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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