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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facd8ecabe269fec8b00ff7aab734c89b69f437835fa19dfcdc52e1a651e5c38' 
  AND token = 'FuoilAfZWblJ52DJWaKVB6y8JFi7A8RvZoHXGBd9pPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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