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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691336a3c62b8bcb4dda5d175a9b346a362d61255d1f404c32bce760c6100e20' 
  AND token = 'xrzbAWKTMs/5luBfkd/+aF1wy3Soq/+NG7MxZLmvMy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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