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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ddeb635f570fc047f8130b4e8ffc7b8b1da6f662300b913d3d8f37370d36b7' 
  AND token = '2e8BsqSFAwnrq8wdKvTiParNTGK9nWYO7r+eR4fLkcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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