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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5130f8e7d6c35df7986501dbe2710a32cbad4cb0f16ef64893d280df1650760' 
  AND token = 'sNlgYE/yDKr5/K1/6lpGE9lr4EQLQx5v/LQUzkUxgrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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