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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb398ca8b4fe835b9f51ca8cda999400274a8c37ad1a0a608140034e6a2f8be' 
  AND token = 'wyPb3F/pQyC+XfF2W9js7x1zZJIbhDRnty4k/Tsovxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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