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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778b13fe24e55d25c014acb684736cc7f76b6c4715a83ef841c1fe4cb2225ffd' 
  AND token = 'W6636OU5FxrttdGd+03JxvqhaZCaBJeYeCkR8jlbf8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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