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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c50cc960bac5daec8260d43b1c188ff90d07babe62a2049b6468192e6dc820' 
  AND token = '39YzQwM64srJ1F8Pdh4T2D8vTsAyT1OT+DFLzQ6aHqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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