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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40530f28072943f768e3b5a04e398099eec98579ec3e2e6f8fa15a7543420a59' 
  AND token = 'c2UXHhKgjqbRzI5REz2KV8oCCswXZrPYt8VMewkSGqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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