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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7461fad687c72e140d8d255322323469a01c3d3f0d010ea89ae0c498198468d' 
  AND token = 'UVgOUxMPxgvZ3r8m4vcLQrPJaGvti2SNq6deCre+4m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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