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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81529105a422aabcf908b5c335f12c920c2df0555339a347e8d4193b417ec7d1' 
  AND token = 'FP9wQy1uHhKKrtG+6Yu439PNfvy2BYnJmu0rP6S9LDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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