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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bec5616d85a89590d4f78539d7a6c211fbcad0ddb02f367206ce1620193c68b' 
  AND token = '9o5FONulXePY2JYXdfg1p8yHMfCDIGHAOqL5u2JCWuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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