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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99e1c5f50834389fee13d0162428e3fc1d56bcc17f22d8c50012301ec782dc4' 
  AND token = 'N5RMLtBaoeS54QskmDZSW9PyNJWtquQEVyq3sksplto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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