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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efabe1d43840575800c5deb243d9f1d1e401f464c5290dd487e8579a0f4a26f3' 
  AND token = '2OE/C8VV4HdRTQa880XIu959hQ04z2SyXKoIw7AX9M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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