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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b599fcb5bc3b3a6b81341d3265b0310d7f856abbfd6a876fbcae07a16a0955' 
  AND token = '+L25ZSoUS1LEKkzIoXHaKwavkjTzpwrjMWaNPt8j6AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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