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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4da3bd96f278564a75941adb6155d63713fbe3d82cf5ffffd6c1f467701b235' 
  AND token = '8D43aWiKt5LL2B/BoIufEks1vam/JgX0t0lAh7Bx6CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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