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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d7902dcbc5606bd87ae9c48c0199bc53d19013d1384e576938eb48e3dce1ee' 
  AND token = 't9rVCnO/UBZ6IuiVDWf+9o1aPqBoWkQvbsyK2oMWnlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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