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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a117e61d9a9188b9f3243ba0ae294535db34e62475bfa82d6bf4a5b10681c1cc' 
  AND token = 'C8ii0EEoRikT9ves/VtRPn2EvVuCC2wyyMZ9vwSjKFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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