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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1640155f4a4c37ac161b8024827bd31c4baa1582d04afae825f0f5904e56d1' 
  AND token = 'vQ7CEqCBi+rRSfMv9YRImXhPl4mIHGY9vUF1v9Wr+B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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