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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39741677b07a9144e6130604e10477d0a17a1a68cd116bb5728c753b4b722395' 
  AND token = 'nMvn5XmGKjp4y7eNK3bfff1qP8qE0prnD5+YZABTUZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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