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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42aa7f67ed2e4cee452ddef128ac2ab14b292a215bcc7e29331c49472315770' 
  AND token = 'NzLXNHlW7d6Jj3eRfKraB4DicVctX7Z4TO2jBUwH3v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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