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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db95208460b9442990983a73c1667b2569bc3ab7a4d574ce8bdf1c3f032edd9' 
  AND token = '7vkk+82oOK4nlUruWEkY46dtiPLQWTJ4FQNIyPJg9w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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