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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b88578657bc2546297c338388484213b3ce5a9c11723173a8a93006492bd75' 
  AND token = 'z6ykNZBi1FcOZ49iiZ/hrf3W6WvsAjZVvsuWpJwfH9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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