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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad55fdd1aaefd39d9f36f42ef6b5e16933c553e7bab6c4a8a5f65f7ee6210ea' 
  AND token = 'J8ZYk0CZ4qMIB9z5JUfl6hYSdFttacEgtrfTK6gn4NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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