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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1385376df9b18d24eadfdc92b27c668d4ad3eb87497556faa12d61391325442' 
  AND token = 'FohzPaE2VOAFuNAFPAA/IHKytw86jWpxc6a6JnCA9jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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