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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c814baa185fe9eb76a46ef3c39d41200a1656ff1df1d8e94f3b490296a378b1' 
  AND token = 'kWwPvvl4v201HBWUGyTGceQmmN9kzaWeywNgw48JUuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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