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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6805e0c98db20421dc810730a04bc10c68f7210cfc3ef621e9db72ebd96c2915' 
  AND token = 'gNW1kWR/14ri6n1WKZLH9QnD9cHOJBcrJgjVvVFP83w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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