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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c251d72059236e5a7ed14eee811f741396c9e2fec5fc92cfba6a540bc5094f73' 
  AND token = 'eHkB6NBmc3usDTAgRozJOj4OKTQOt5FbWpE3A/Y2cnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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