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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66e9124d724a80eb4b88a2bf8b126bdfc5f35f84ea9d43989b6e592e9ba7412' 
  AND token = 'Hzi1J4XSPY806B24EYgyEBjP7ZgEYsJp0rQvSnV9iR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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