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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ed56953c3a26c074eb5d0188e95478a6be80fd3f8225854a40eef3d2a6fa13' 
  AND token = 'xoG4QtPtcg+ApvODwbSv/fiVBlSWhfvnooxcxAln69I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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