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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ba5794f1c396e040c4f4fb0841b2de8bfea47e89412f606c0194ddfd6983f7' 
  AND token = '8zDF/xHT5Pnc2zUFn1jnhYyq3nTEuZUWIvXb/uUaKTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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