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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928528097ba5fb6f68fb9648b059e606e8b48502faf8a3c8cde9cf22f5e5d1a6' 
  AND token = '/vPxkcSWqatfRZY+2C6EsnFAflnJjEKAW2p62210Y04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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