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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f143aac8ea69c1133f975e76e87ebec039d9c3f2c0772b535356e8610e5b4b' 
  AND token = 'syLQ3aSfSnAEdX7v7cLduUJFn0caziHgYlOWn/vXwTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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