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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d009c7ace8922247dfe7e6afac7dae337a24f010290fb4fd30bc6d96220e00' 
  AND token = '6M6OSwadM+EFCIbYAn+Cw2vXKLgCq/FUlsma71+A5i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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