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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cacefea1ed4a316547be19a69294abe2c9dd14bac39a77ffe5b88d4b2dcfddf' 
  AND token = 'iGblocbUDmWy1EKyff3n4w5TKrnvRu2t3Fjz7sNoubk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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