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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c97e6c3d317ee552232737f297ccfa512dc673fb50a44d1b545b73b92aa17f' 
  AND token = 'G0tuOF2vCVB6ODdfnm6N6VZ1JsB+KMoQfWI25PhMnsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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