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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3c96897d77171560e7a502b36a8ee066a16b2c86f2dcfe1ac4e50d0664863f' 
  AND token = 'f4glKxfgSQS6n0sqhNmHyC61uBoDgJVu++/+A/KFLi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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