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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e890d0bbbe3cee3bc1a66d76f21c97e5b40a33cc3cc40f9503f84ad51ef23e6' 
  AND token = 'x8jycHrLv5HewbBJuO8MRtO3yU56tcjd9owkjvvpzqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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