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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899c09240ffd3acecb5ef6bead4578a0de480e97ab381ab34c7a12eeec9ae679' 
  AND token = 'P1ihRYOzE7GsLUAqdsN9AXQlWwh0sw7b7uJNCBuj2HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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