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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518218c7933c6243a35fe7155c22b6aca793f888b07c2bac3332e4507bda8417' 
  AND token = 'f7pS4+5MBQwNe5XE/9XWnEbnVnCz3RCzwkaI629mQ+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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