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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8f5d61860a795379534d14b91c5b1324dfbb4fa5025401e841b2fe0c57df40' 
  AND token = 'uTRecfUWpjpQQzA+OU1XDg+MPJAYyB+u6hukElh8OIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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