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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca197c42bcf26852d7b7845030bf6b94c265ec880537713998383fa2ef520367' 
  AND token = '1ZhwNwHM1Br/3yxL9caryXtLbervBw/z70ogEszPSpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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