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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd471b967876b0a9c1221a46f071c632f2bbec0d3ce847cd25c564aae777e89' 
  AND token = 'B6/AYXg4myZ756p+NEKg+o0LVE9OkVPaR8ND30HH6QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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