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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d00d6a50556a67bc54d32aed95476957dc6f83b2dc263b15b8c860547fe4782' 
  AND token = 'tQbE6Uqlj5LLxp1JPN/ox4nIuHVdo/5qRhXpnac1/wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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