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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4136778bd715d07037ba4e21b518f0fdedb00b66ee6555d2f99132320f885a24' 
  AND token = 'qQXmM/ckNvkissQw+3e6t5ph9nO7FXD5uYmNYbVVxU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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