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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9b8e0878fbee22d4020b762cba98bebdb0f476f77f13f35ba209d181a2e01d' 
  AND token = 'qxX+KzsktU9SPCbQO0gPFyLm40DJp8LE0fcjSZq0dIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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