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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c5cf6ddde13e79952069976a80ca2d7aba31396f7805edae5470abb8cd8602' 
  AND token = 'SF73IOcrM26qHnz55UKiWYXUyTbrZJ8L67jd6GvGATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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