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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a629ad240cb6e95289e5afc6272ae300a2beba8f07f56ebcb95f586a84cd880' 
  AND token = 'e5dl+jfnoYcFe7v7aGQQ1LwJ4vTXVmxe436ABzNXHy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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