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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1c7d9399bd3d685ca83708b2ff45d43936f2fc2504f5953c1dd3a218c35984' 
  AND token = 'Oer/IKXQdjTOHnvZFrptShaNEw7OjSzQ9pTv2ikR6m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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