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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4525deef291a8ecab6097db4d6b88776a87466fd823e2508ce761f1e55b6c846' 
  AND token = '7tfHmfsEODLcsp0OtPj9UnfvZi7GDa86ePfnbOuYbJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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