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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97cc1c6463cd642504f6bea524aea0b0420d2f8d93073604df0e7b9a8ad7be0' 
  AND token = 'xgvKN/U9bgTJ2ffTzDci29qwgfX5jYLj/3uy5QkT2zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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