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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4616ccc43f68e037e379d74a9322949d0bea4d5ca21ec9c889af94c463ea469e' 
  AND token = 'Or11OiDkjZKZV4InHke5QuY++H75LMvfWP+FWt+2Q3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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