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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8a85865c39c812f2db3201d7d751cbd243cca2e89515176f91f302ead9ce30' 
  AND token = 'OwsceooYLfXtNjpWsK4Vn58tho104EsFYDlgccvOLVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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