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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5b215c621d7113b45259347726186650c220a99a1f52c410055d8a1285b9bb' 
  AND token = '879PZHDV65r4L9qpmrgQrQ4IJU7dcl8z/Fg6zLTSPRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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