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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8796dc0b5fbc8d9fb2d6c60154a2e28a70408666845e39750b731f9ec85d77cf' 
  AND token = 'TQd4LyM/NKFEa/CmSdsGc0M/P25Jsxk22VZy+qMEvE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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