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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4028ff6a92185ff6828ecd8c0f17dcd9cac9780687d570ebc7acfa5fa10a99' 
  AND token = 'PZY0/dAIUGq4HtRUxZ6QZrPYluL/ttBMHbQ+veeR8mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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