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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a209f63722b089917a9ee854dfbe0937dec221cb3fa518a293febc22ad044cf2' 
  AND token = 'qmt6/VDfvJ0hmCWpucGSHxW54G5acJc4eLM7CQ3hnXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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