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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d86f41540306dc62873315238437afa38361f8ce49401ddac53508447ce3b15' 
  AND token = 'yY7xhRcfc7RSIIPvQVPq7y504hZVdGfYi1FnC8HBLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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