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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc12057ed64c52a42ccd457ed3c9b2be0620e0baf913f1f94548c99dae9a4d22' 
  AND token = '0n/hWBTo9bTjs3wCd4PZ4QpETIBQt+GmCEc8iIwvuLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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