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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504cc9c337856729edb0c351485b75086c0175a8d3a211bcda0c14f6121ddf57' 
  AND token = 'fAsQP6B0IHZjci0UqYTelS9pWEnlGXvGdxEwAfL6CBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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