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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97e366a95ed9ca04e54bd497a55da7a6ec8ece1b83fdb7967dfbddc6291975f' 
  AND token = '7Ah7Z3B6N3g9UyKHt6s4AmtzYKFlbaxGxIYKILSBWiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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