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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947c8c540efe792aeae16093d5b8a33d9e5d80237be1eac4bc842ad1750b63e8' 
  AND token = 'Xp8mBTt2yrRRCHFJLHZvub3b7axtu8pSXbVi8mL0wzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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