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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9868e253611141573525c60fada762ae4f8de41f00154b28e1ecf66e99bf55fb' 
  AND token = '0ixjrKJ3x/ANsU06dpYK1Z64n30rjsPJtJrHtMgj4Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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