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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed96000d70e374e38b96b6dd6b5aa66ceff67c8ab3e3865f075a240cc79f6ad3' 
  AND token = 'DgJdPd91VBYnmvKl6aw51LZ9E04zsMqkkn9ebp4o/mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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