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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb1bab60d068f47853625b7b031cd02184b933846e085a2de7754f81c92e583' 
  AND token = 'W+ujJjUJF0HlB83lvUySJc/Ihx2bVCtSa4Q0tOk/fuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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