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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b4b832075f281a3a10f8f6d972eba2173a45ab1717fc98dc49d9bec60b44f8' 
  AND token = '+mzFdvFSh2jCTnAMkkJMA0+62vED43A7VpHEG+wsbCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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