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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87e0e43404462b8d36b5c0776e12eb7c79acaeaca69eaccfb484e3b83578c6f' 
  AND token = '9nI9guiWJNVay2KLi4qISaEMsRM4pLR+9az5aIuSe8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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