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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dfb3a51264fb2b9b30aba4af29dec52b4259a85e4c5cf569415e06eb845e46' 
  AND token = 'vSRr6jJ10K7QT/h7XmLuNmdKX/skyP5POIaNCCWb8zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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